JPS60255497A - Method of transferring picture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image transfer method, and more particularly to a method for creating a color proof by image transfer in a plate-making process.

Conventional technology When creating a printing plate using plate-making materials such as 28 plates from a color original and printing a large number of sheets at once, the color original is usually printed with a 4-color halftone negative (or halftone dot) using a color scanner, etc. )
After creating the image, a four-color one-sheet positive is created through processes such as pasting, turning, and retouching, and proof printing is performed to confirm the finished product before final printing. In this case, checking functions such as checking scanner disassembly in the process of creating net negatives or positives, checking pasting etc. in the process of creating single-sheet positives, and confirming the print orderer in the proof printing process will ensure a good print finish. Color proofs are created and checked for this purpose. As photosensitive materials for creating color proofs, there are known photosensitive materials using silver halide photography, photosensitive materials using electrophotography, and photosensitive materials using photopolymers. Depending on the purpose of use, there are both negative-positive and positive-positive methods. An example of a method for creating such a color proof is as follows. first,
The photosensitive layer of a photosensitive material having a photosensitive layer on a support is transferred to a transfer paper by applying pressure and heat, and image exposure and development are performed to form a first color image on the transfer paper. Next, a second photosensitive layer is transferred thereon in the same manner, imagewise exposed and developed to form a second color image on the same transfer paper.

This operation is repeated four times in total for yellow, magenta, cyan, and black to form a multicolor image.

In this case, the photosensitive layer is transferred onto the transfer paper by various methods, such as by simply applying pressure, or by applying pressure and heating at the same time. For example, one of the roller pairs or The photosensitive layer is transferred by using both as heat rollers and passing the photosensitive material having the photosensitive layer and the transfer paper in a stacked state between them.

In the present invention, a color proof is produced by subjecting a photosensitive material to imagewise exposure and, after development, transferring the resulting image to an image-receiving sheet. In this case, a multicolor image is created by creating yellow, magenta, cyan, and black color images using four sheets of photosensitive material, and sequentially transferring these to the same image-receiving sheet.

In this method, unlike a method in which an image is formed by exposing a photosensitive layer transferred onto a transfer paper, the formed image is sequentially transferred one color at a time, so it is necessary to perform image transfer with strict precision. That is, since the image transferability in this case is greatly influenced by the transfer temperature, it is necessary to strictly maintain the temperature during transfer.

Conventionally, when using a commonly used transfer device, the heating time is short, so it is necessary to raise the temperature extremely, and the sheet inserted between the rollers is partially stretched, causing the transfer image to deteriorate. This method has disadvantages in that it causes color shift and uneven transfer.

In this case, since both the image sheet and the image-receiving sheet are made of soft materials, the overlaid sheets warp during the image transfer process, that is, when pressed by the heat roller. There is a problem in that the sharpness of the transferred image deteriorates due to misalignment between the two sheets or wrinkles during movement. In particular, when creating a color proof, image transfer processing is usually performed four times, so color misregistration becomes an extremely serious problem.

Purpose of Development In view of the above-mentioned problems, the present invention provides the following features in image transfer processing:
It is an object of the present invention to provide a transfer method that does not cause wrinkles in superimposed images or image-receiving sheets, or misalignment between the two sheets.

Structure of the Invention The object of the present invention is to provide a transfer method in which an image transfer process is performed by overlapping an image sheet on which an image is formed and an image receiving sheet that receives the image and applying pressure, or applying pressure and heating. Achieved by a transfer method characterized in that a supporting plate having good thermal conductivity and rigidity is superimposed on both sheets, and a cover sheet is superimposed on the opposite side of the supporting plate, and then image transfer processing is performed. be done.

Hereinafter, the transfer method of the present invention will be explained in detail with reference to an embodiment shown in FIG.

Figure 1 (A) is a plan view of the positioning plate used in the method of the present invention, however, Figure 1 is a side view showing the intermediate state of the method of the present invention, and Figure 1 (c) is a side view showing the completed state of the method of the present invention. This is the side that shows.

In the transfer method of the present invention, first, holes for positioning are made using a punch or the like in each image sheet and image receiving sheet on which images are to be formed by color separation. Thereafter, each image sheet is exposed and developed, and the holes have shapes corresponding to the two pins 2 and 3 provided on the positioning plate 1 shown in Figure A, for example, a circular pin 2 and an oblong pin 3. Drill a hole that fits. In this way, the combination of the pins y2.3 of different shapes and the holes corresponding to the pins 2, 3 enables image alignment.

Thereafter, the image receiving sheet 5 is placed on the guide plate 4 (see figure B) on which the positioning plate 1 is mounted, and the two pins 2,
3, and then the image sheet 6 of the color to be transferred first is similarly aligned and superimposed thereon. Thereafter, a cover sheet 7 is placed over the image sheet 6 so as to cover the lower front portion of the support plate 4, and the positioning plate 7 is removed.

The support plate 4 is a thin plate made of aluminum, for example, which has good heat conductivity, and its thickness is approximately 0 in consideration of thermal conductivity and rigidity.
．． The length is about 5m. Further, the support plate 4 is provided with holes into which both the pins 2 and 3 are fitted, and in particular, the positional accuracy (image alignment) between the image sheet 6 of the second and subsequent colors and the image receiving sheet 5 is improved. Therefore, the surface on which the image-receiving sheet 5 is placed is treated with white alumite so that fine adjustments can be easily made visually.

The guide plate 4 is used, for example, to sandwich a superimposed transfer product (a guide plate 4, an image receiving sheet 5, an image sheet 6, and a cover sheet 7 integrated) by a pair of upper and lower heat rollers. It has the effect of imparting rigidity to the transferred object when it is pressed and heated while being conveyed (in the direction of the arrow in Figure 0), or when being handled in other ways.

The cover sheet 7 has a thickness of, for example, about 100 μm in consideration of thermal conductivity and operability. Plastic resins such as PET resin and resin can be used.

The cover sheet 7 presses the image sheet 6 and the image-receiving sheet 5 against the support plate 4 so that both sheets 5,
6, and also prevents dust attached to the pressure and heating member (heat roller) from adhering to the transferred object, and also prevents the adhesive layer of the image receiving sheet 5. This prevents the adhesive from adhering to the pressurizing and heating member.

Furthermore, since the support plate 4 has rigidity, it not only improves the workability of carrying it, but also has the effect of preventing displacement during movement.

In addition, when performing image transfer of two or more colors, the image receiving sheet 5 on which the previous transferred image was formed and the next image sheet 6 are positioned using the method described above, and further fine adjustment of image alignment is made by visual inspection. After this, the above-described transfer processing step is repeated. Note that fine adjustment by visual inspection is preferably performed using light shining from above.

In the embodiment, the support plate 4 is made of aluminum, and the cover sheet 7 is made of PET resin, but the present invention is not limited to this.

That is, the supporting plate 4 is not particularly limited as long as it has good heat conduction and rigidity, and the cover sheet 7 is also limited to plastic resin as long as it has good heat conduction and ease of handling. Instead, for example, a thin metal plate or the like may be used.

Effects of the Invention According to the present invention, before the image sheet 6 and the image-receiving sheet 5 are superposed and transferred, the support plate 4 is placed on the lower side and the upper side is covered and wrapped with the cover sheet 7. This imparts rigidity to the transfer object and prevents dust from adhering to it, making it easier to handle the transfer object and improving the workability of the transfer process.

In addition, by increasing the rigidity of the transferred material, deformation such as warpage when pressurized by a roller or the like is prevented, so that misalignment between the image sheet 6 and the image receiving sheet 5 is prevented. is prevented, and image clarity is improved.

Furthermore, since the surface of the support plate 40 is treated with white alumite, it is extremely easy to make fine adjustments when aligning images visually, and since it has rigidity, it improves workability and positioning when carrying. Effective in preventing chafing.

Note that the method of the present invention can also be applied to retransfer from the image-receiving sheet 5 onto a printing paper for trial printing and matting of the trial printing product.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram illustrating one embodiment of the method of the present invention. ' 1...Positioning plate, 2, 3...Bin, 4...
・Support plate, 5... Image receiving sheet, 6... Image sheet,
(3 others) Figure 1 (A) 1 (C) Procedural amendment July 1980 Date 1 Indication of the case Patent Application No. 112020 of 1982 2. Name of the invention Image transfer method 3. Make amendments Name of patent applicant (520) Fuji Photo Film Co., Ltd. Kasumigaseki Building Post Office P.O. Box No. 49 Eiko Patent Office Telephone (581)-9601 (Representative) Showa (Monday, Day, Showa) (Shipping date: Showa, Month, Day) ) The statement in the column "1. Detailed Description of the Invention" in the specification is amended as follows. 1) On page 6 of the specification, line 6 from the bottom, K after “extract.”
, ``Furthermore, although it has been explained that the cover sheet 7 is attached so as to wrap around the front lower side of the support plate 4, the present invention is not limited to this. 2) In the 4th line from the bottom of the 7th page, replace ``Approximately 100 μm.'' with ``
8 3) Page 7, line 6 from the bottom, "Can be used."
"Also, the surface of the cover sheet 7 is coated with a silicone coat to prevent adhesion to the image sheet 6,"
A fluorine resin coat or the like may be applied. ” is inserted. 4) On page 9, line 6, after “A thin metal plate is acceptable.”
``Furthermore, although an example has been described in which the surface of the support plate 4 is subjected to white alumite treatment, the present invention is not limited to this, and any type of material that allows fine adjustment during image alignment may be used.
For example, a metal plate coated with white paint may be used. ”
Insert. 5) On the 9th page, line 1 from the bottom, change "Workability and position" to "
Improved work efficiency and improved positioning. 6) On page 10, line 6 of the same page, "trial-based product" is corrected to "trial-based product". that's all

Claims (1)

[Claims] In a transfer method in which an image transfer process is performed by overlapping an image sheet on which an image is formed and an image-receiving sheet that receives the image, or by applying pressure or heating, it is possible to A transfer method characterized in that an image transfer process is performed after superimposing a support plate having a support plate on both of the sheets and superimposing a cover sheet on the opposite side of the support plate.